The first major solar flare of 2014 could actually force some airlines to re-route flights due to the higher doses of radiation in the upper atmosphere.
A shipment to the International Space Station also had to be delayed.
The Associated Press said
The flares travel thousands of miles a second and could cause the Northern Lights to stretch southward to Colorado and Illinois Thursday morning around 4:00am EST.
Here is the alert NASA posted on Space Weather.gov
Serial Number: 27
Issue Time: 2014 Jan 08 2334 UTC
ALERT: Proton Event 10MeV Integral Flux exceeded 1000pfu
Begin Time: 2014 Jan 08 2320 UTC
NOAA Scale: S3 – Strong
Potential Impacts: Radiation – Passengers and crew in high latitude, high altitude flights may experience increasing radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to elevated radiation levels.
Spacecraft – Single-event upsets to satellite operations, noise in imaging systems, and slight reduction of efficiency in solar panels are likely.
Radio – Degraded or episodically blacked-out polar HF (high frequency) radio propagation.